feels like nobody knows i exist

exactly the title. i’ve always been a quiet person but this year it’s gotten to the point where i can pretty much get by without saying a word to anyone and nobody would think that’s unusual. i have a friend group of 8 people and i do go for lunch and stuff with them but they barely talk to me. it’s not like they don’t like me, i think they’re just waiting for me to talk first. but sometimes i do and i don’t know if they even hear or i’m not funny enough or what. i talk to some of them personally, but the conversations are only centered on school or how they’re feeling. whenever they do stuff together, they don’t exactly tell me or try to get me involved (though i may be reading it wrong?) it’s like whether i’m there or not it won’t make a difference. i know they all consider me a friend but none of them know me at all, and it’s getting harder to talk to anyone.
do they think i’m just an introvert and are giving me space or do they just genuinely not care if im there or not? and do my ‘friends’ even know i feel ignored?

tldr: i feel non existent in my friend group